2 files changed, 0 insertions, 140 deletions
diff --git a/src/platform/metal/metal_context.h b/src/platform/metal/metal_context.h
deleted file mode 100644
index f1e376b..0000000
--- a/src/platform/metal/metal_context.h
+++ /dev/null
@@ -1,16 +0,0 @@
-#pragma once
-
-// Pure-C++ interface to the Metal backend (no Objective-C leaks into the rest
-// of the engine). Implemented in MetalContext.mm.
-namespace Donut
-{
-    // Phase 1 bring-up: creates the default Metal device + command queue and
-    // logs its capabilities, proving the Metal toolchain and build integration
-    // work natively on Apple Silicon. This grows into the Metal compute island
-    // that runs the geodesic ray tracer in real time.
-    auto metal_probe() -> bool;
-
-    // Compiles + dispatches a trivial compute kernel and validates the read-back,
-    // proving the Metal compute path the geodesic ray tracer will run on.
-    auto metal_compute_self_test() -> bool;
-}
diff --git a/src/platform/metal/metal_context.mm b/src/platform/metal/metal_context.mm
deleted file mode 100644
index 71e8551..0000000
--- a/src/platform/metal/metal_context.mm
+++ /dev/null
@@ -1,124 +0,0 @@
-#import <Metal/Metal.h>
-#import <Foundation/Foundation.h>
-
-#include "metal_context.h"
-#include "core/log.h"
-
-#include <vector>
-
-namespace Donut
-{
-    bool metal_probe()
-    {
-        @autoreleasepool
-        {
-            id<MTLDevice> device = MTLCreateSystemDefaultDevice();
-            if (device == nil)
-            {
-                DONUT_ERROR("Metal: no default device available");
-                return false;
-            }
-
-            id<MTLCommandQueue> queue = [device newCommandQueue];
-            const char* name = [[device name] UTF8String];
-
-            DONUT_INFO("Metal device: {}", name ? name : "(unknown)");
-            DONUT_INFO("Metal: unified memory = {}, max threads/threadgroup = {}",
-                       device.hasUnifiedMemory ? "yes" : "no",
-                       (unsigned long)device.maxThreadsPerThreadgroup.width);
-
-            if (queue == nil)
-            {
-                DONUT_WARN("Metal: failed to create command queue");
-                return false;
-            }
-
-            return true;
-        }
-    }
-
-    // Compiles a trivial compute kernel, dispatches it over a small texture, and
-    // reads the result back to confirm the full Metal compute path works: source
-    // compilation, pipeline state, command encoding, dispatch, and shared-memory
-    // read-back. This is the mechanism the geodesic ray tracer will run on.
-    bool metal_compute_self_test()
-    {
-        @autoreleasepool
-        {
-            id<MTLDevice> device = MTLCreateSystemDefaultDevice();
-            id<MTLCommandQueue> queue = [device newCommandQueue];
-            if (device == nil || queue == nil)
-                return false;
-
-            NSString* src =
-                @"#include <metal_stdlib>\n"
-                 "using namespace metal;\n"
-                 "kernel void selfTest(texture2d<float, access::write> outTex [[texture(0)]],\n"
-                 "                     uint2 gid [[thread_position_in_grid]])\n"
-                 "{\n"
-                 "    uint w = outTex.get_width();\n"
-                 "    uint h = outTex.get_height();\n"
-                 "    if (gid.x >= w || gid.y >= h) return;\n"
-                 "    outTex.write(float4(float(gid.x) / float(w - 1),\n"
-                 "                        float(gid.y) / float(h - 1), 0.5, 1.0), gid);\n"
-                 "}\n";
-
-            NSError* err = nil;
-            id<MTLLibrary> lib = [device newLibraryWithSource:src options:nil error:&err];
-            if (lib == nil)
-            {
-                DONUT_ERROR("Metal self-test: kernel compile failed: {}",
-                            err ? [[err localizedDescription] UTF8String] : "unknown");
-                return false;
-            }
-
-            id<MTLFunction> fn = [lib newFunctionWithName:@"selfTest"];
-            id<MTLComputePipelineState> pipeline =
-                [device newComputePipelineStateWithFunction:fn error:&err];
-            if (pipeline == nil)
-            {
-                DONUT_ERROR("Metal self-test: pipeline creation failed");
-                return false;
-            }
-
-            const uint32_t W = 64, H = 64;
-            MTLTextureDescriptor* desc =
-                [MTLTextureDescriptor texture2DDescriptorWithPixelFormat:MTLPixelFormatRGBA8Unorm
-                                                                   width:W
-                                                                  height:H
-                                                               mipmapped:NO];
-            desc.usage = MTLTextureUsageShaderWrite | MTLTextureUsageShaderRead;
-            desc.storageMode = MTLStorageModeShared;
-            id<MTLTexture> tex = [device newTextureWithDescriptor:desc];
-
-            id<MTLCommandBuffer> cb = [queue commandBuffer];
-            id<MTLComputeCommandEncoder> enc = [cb computeCommandEncoder];
-            [enc setComputePipelineState:pipeline];
-            [enc setTexture:tex atIndex:0];
-
-            MTLSize tg = MTLSizeMake(16, 16, 1);
-            MTLSize grid = MTLSizeMake(W, H, 1);
-            [enc dispatchThreads:grid threadsPerThreadgroup:tg];
-            [enc endEncoding];
-            [cb commit];
-            [cb waitUntilCompleted];
-
-            // Read back the far corner; the kernel writes (~1, ~1, 0.5, 1) there.
-            std::vector<uint8_t> px(W * H * 4);
-            [tex getBytes:px.data()
-              bytesPerRow:W * 4
-               fromRegion:MTLRegionMake2D(0, 0, W, H)
-              mipmapLevel:0];
-
-            size_t corner = ((size_t)(H - 1) * W + (W - 1)) * 4;
-            DONUT_INFO("Metal compute self-test: corner pixel RGBA = ({}, {}, {}, {})",
-                       (int)px[corner + 0], (int)px[corner + 1],
-                       (int)px[corner + 2], (int)px[corner + 3]);
-
-            bool ok = px[corner + 0] > 250 && px[corner + 1] > 250 &&
-                      px[corner + 3] == 255;
-            DONUT_INFO("Metal compute self-test: {}", ok ? "PASS" : "FAIL");
-            return ok;
-        }
-    }
-}